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This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 2. |
Search information 4&5state of matter |
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Answer» Explanation: PLASMA is one of the four fundamental states of matter, and was first described by chemist Irving Langmuir in the 1920s. Bose–Einstein condensate (BEC) is a state of matter of a dilute GAS of low densities called bosons cooled to temperatures very close to absolute zero (-273.15 °C). Under such conditions, a LARGE FRACTION of bosons occupy the lowest quantum state, at which point microscopic quantum phenomena, particularly wavefunction interference, become apparent macroscopically. A BEC is formed by cooling a gas of extremely low density, about one-hundred-thousandth(1/100000) the density of normal air, to ultra-low temperatures. This state was first predicted, generally, in 1924–1925 by Satyendra Nath Bose and Albert Einstein. |
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| 3. |
Elements 1 to 30 with symbols |
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Answer» Answer: Explanation: Here is a list of 1 to 30 elements with respective symbols and atomic NUMBERS:- Atomic No. Element Symbol 1 Hydrogen H 2 Helium He 3 Lithium Li 4 Beryllium Be 5 Boron B 6 Carbon C 7 Nitrogen N 8 Oxygen O 9 Fluorine F 10 Neon Ne 11 Sodium Na 12 Magnesium Mg 13 Aluminium Al 14 Silicon Si 15 Phosphorus P 16 Sulphur S 17 CHLORINE Cl 18 Argon Ar 19 Potassium K 20 Calcium Ca 21 Scandium Sc 22 Titanium Ti 23 Vanadium V 24 Chromium Cr 25 MANGANESE Mn 26 Ferrous Fe 27 Cobalt Co 28 Nickel Ni 29 Copper Cu 30 Zinc Zn Hope it helped and satisfied you!! :) |
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| 4. |
Why does Hydrogen reacts with Chlorine although both are Non-metals. |
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Answer» ➡️ Hydrogen reacts with chlorine simply DUE to the fact that due to this reaction, hydrogen as well as chlorine will be able to ATTAIN the stable electronic configuration of the nearest noble gas. ➡️ Hydrogen reacts with chlorine to FORM hydrogen chloride ( a polar compoumd ). In case of hydrogen chloride molecule, hydrogen ATOM shares an electron pair with chlorine atom such that hydrogen acquires a duplet configuration and chlorine an octet, resulting in the FORMATION of a single covalent bond. |
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| 5. |
Why more serious burn's are caused by steam t 100°c than water at the same temperature |
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Answer» Answer: it is as follows Explanation: because steam has more ENERGY which helps it move fast and CAUSE SEVERE BURNS that of water hope it helps u Follow me..... |
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| 6. |
Iron metal dissolves in copper sulphate solution forming iron sulphate and copper |
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Answer» yes because IRON or ferrous is more REACTIVE than copper so it DISPLACE copper from copper SULPHATE solution to form light green color iron sulphate and copper |
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| 7. |
Solve any molecular orbital theory question in seconds follow my youtube channel kota premium |
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Answer» SORRY but there is no QUESTION in ATTACHMENT |
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| 9. |
Differentiate molecular mass and formula unit mass |
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Answer» Answer: molecular mass : the total mass of the ELEMENTS present in a MOLECULE or a substance is KNOWN as molecular mass the total mass of the elements present in a formula is known as formula unit mass |
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| 10. |
Write the name and valency of 1, 2, 13, 14, 17 and 18 element and tabulate them as shown below. |
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Answer» Dhdhey the is an the only way only the people who are there in the their league office have a GOOD BETTER choice to join in the living AREA and to be a |
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| 11. |
2.2 g of a compound of phosphorous and sulphurhas 1.24 g of 'P' in it. Its emperial formula is - |
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Answer» <P>Answer: The RATIO of weights of P:S is 1.24:[2.2−1.24] = 1.24:0.96. The MOLAR ratio is 31 1.24
: 32 0.96
=4:3. THEREFORE, the formula of the compound is P4S3
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| 14. |
List the characteristic feature of elements compounds and mixture with example |
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Answer» Answer: Compound: two or more different atoms chemically BONDED together. Molecule: two or more different or same atoms chemically bonded together. Element: one single atom. A mixture contains two or more substances (elements, lattices, molecules, compounds), that are not chemically bonded together. Mixture: Mixtures are the substances composed of two or more FORMS of matter. You can separate them by PHYSICAL methods. |
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| 15. |
Why does milkness disappear when CO2 is passed through Lome water in excess |
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Answer» due to tyndall effect milkness DISAPPEARS when CO2 is passed through Lime WATER in EXCESS |
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| 16. |
Give example of commonly used irragation syatem in our country |
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Answer» the commonly used IRRIGATION system in INDIA are
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| 17. |
When electricity is passed through water then two gases hydrogen and oxygen are produced on the other hand when heat is supplied to water then another gas steam is produced what type of change take place in the first case be in the second case |
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Answer» Answer: 1st PROCESS is the process of ELECTROLYSIS and SECOND is EVAPORATION |
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| 18. |
How do the nostrils contribute to the process of breathing? Explain briefly |
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Answer» Explanation: How do the NOSTRILS contribute to the process of breathing? When we BREATHE in AIR, it passes through our nostrils. ... The mucus and HAIR present in the nostril catch the DIRT, dust and disease-causing germs. |
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| 19. |
Why do we need alternative source of energy |
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Answer» we NEED ALTERNATIVE source of energy for live if we have this energy we are EFFICIENT for doing anything work in the world |
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| 21. |
How many diffrent kinds of atoms are there |
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Answer» heya... There are more than 109 different types of atom - one for each element. DIFFERENCES between the atoms give the elements their different chemical properties. In 2001, there were 115 known elements. However, those above 109 are highly unstable and have been MADE in only TINY quantities. hope it help u |
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| 22. |
Pcl5 is reactive but sf6 is stable.Explain |
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Answer» Because phosphorous can shows covalency of 5 and it has more polarising POWER that's why it is more covalent in nature and reactive whereas SF6 has OCTAHEDRAL structure it has highly stablised structure that why sf6 is stableExplanation: |
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| 23. |
Digestion of food is not a chemical change.. True or false |
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Answer» it is obviously false..... . ........ MARK me as brainlieast... |
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| 24. |
Major wool producing countries are |
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Answer» Production Australia: 25% of global woolclip (475 million kg greasy, 2004/2005) China: 18% United STATES: 17% New ZEALAND: 11% Argentina: 3% Turkey: 2% Iran: 2% United Kingdom: 2% |
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| 25. |
Silk and wool fibres are made of |
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Answer» heya Mate... Animal fibers are natural fibers that consist largely of particular proteins. Instances are silk, hair/fur (including WOOL) and feathers. The animal fibers used most commonly both in the manufacturing WORLD as well as by the hand SPINNERS are wool from domestic sheep and silk. follow me... please Mark me as brainliest. |
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| 26. |
Wool fibres are straightened by the method known as |
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Answer» Answer: straightened fibres are spun or twisted TOGETHER to make YARN the BULLION is the news to knit woolen fabric,sweaters etc. This is called spinning. |
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| 27. |
Define the formula mass |
Answer» The formula MASS of a molecule (also known as formula weight) is the sum of the ATOMIC weights of the atoms in the empirical formula of the COMPOUND. Formula weight is given in atomic mass UNITS (AMU). |
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| 28. |
Water is liquid at room temperature give reason? |
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| 29. |
Q6. When a solid melts, its temperature remains the same . Give reason. |
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Answer» YES because the TEMPERATURE of water on cooling is same as solid is MELTING. |
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| 30. |
Redox rxn for Mno2+4HCL-MnCl2+Cl2 |
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Answer» In the REACTION Mno2+4HCL->Mncl2+Cl2+2H2O , Cl is the substance which is oxidized from HCL & it is the REDUCING agent for the MnO2 as well. |
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| 31. |
What is Marcuric chloride chemical formula |
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| 33. |
How many electrons are present in 1 mole of methane? |
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Answer» Answer: |
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| 34. |
How is combination reaction is an oxidation reaction? |
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| 35. |
Shashi bought new silver anklets. After a month she found that the anklets turn black. She has doubt that it is not of pure silver but her neighbor Rakhi advised her that it is of pure silver and wash it with tamarind or lemon juice to get the luster back. She followed the advice and get the luster of her anklet back. Read the above passage and answer the following questions: (a) Do you think that the anklets are not of pure silver? (b) Why these turn black after sometime? (c) Why the anklets become lustrous on washing with tamarind or lemon juice? (d) What values are exhibited by Rakhi? |
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Answer» No. Due to reaction with ATMOSPHERIC oxygen. The DIRT and others will be washed away. She gave good advice. |
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| 36. |
Why it is the 3rd option but not the 1st one? |
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Answer» Answer: (C) is the correct answer because the coefficient is written as 1/n and the QUESTION is asking u the VALUE of -d[A]/dt and not 1/a ×-d[A]/dt |
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| 37. |
Small note on THOMSON MODEL OF AN ATOM . |
Answer» HEY MATE HERE IS THE ANSWERSMALL NOTE ON THOMSON MODEL.Thomson atomic model was proposed by William Thomson in the year 1900. This model explained the description of an inner structure of the ATOM theoretically. It was strongly supported by Sir Joseph Thomson, who had discovered the electron earlier. During cathode ray tube experiment, a negatively charged particle was discovered by J.J. Thomson. This experiment took place in the year 1897. Cathode ray tube is a vacuum tube. The negative particle was called an electron. Thomson assumed that an electron is two thousand times lighter than a proton and believed that an atom is made up of thousands of electrons. In this atomic structure model, he considered atoms surrounded by a cloud having POSITIVE as well as negative charges. The demonstration of the ionization of air by X-ray was also done by him TOGETHER with Rutherford. They were the first to demonstrate it. Thomson’s model of an atom is similar to a plum pudding. HOPE IT MAY HELP ✔ ✔THANK YOU ❤ ❤ |
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| 38. |
The reactions of calcium phosphate plus acid produces calcium sulfate and phosphoric acid |
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Answer» Explanation: An aqueous phosphoric acid SOLUTION reacts with an aqueous calcium hydroxide solution to produce WATER and SOLID calcium phosphate |
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| 39. |
Q1. A gas jar containing air is placed upside down on a gas jar of bromine vapours. It isObserved that after sometimes, the gas jar containing air also becomes completely reddish brown.a) Explain why this happens.b) Name the process involved |
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| 40. |
Formation of hydrogen molecule from hydrogen atom entropy change |
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Answer» Diatomic hydrogen MOLECULES, H2, are formed at ORDINARY temperatures and PRESSURES. ... The hydrogen atom has a valency of 1 and it tends to form a chemical BOND with another atom. It forms a covalent bond with another atom of the same kind to form H−H. |
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| 41. |
How many marks of numericals asked in chemistry class12? |
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Answer» Answer: As chemistry have only 3 chapters which are numerical BASES according to previous year record approx 15 MARKS questions are based on numerical. every time they change their Data. but soon CBSE will release marking scheme u can CHECK there. |
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| 42. |
Find the limiting reagent of the dihydrogen gas reacts with dioxygen gas to form water vapour |
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Answer» the QUESTION is INCOMPLETE I GUESS |
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| 43. |
A gas fill completely the vessel in which it is kept |
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Answer» YES it is TRUE, I THINK your QUESTION is INCOMPLETE |
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| 44. |
Change in colouxLor) Evolution of gasM Change in temperatureHence By this, we can determinereaction has taken placesthat ofwhat isChemical equations with examples |
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Answer» Explanation: |
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| 45. |
give the chemical name and formula of following common salt caustic soda washing soda baking soda bleaching powder plaster of paris quick lime limestone slaked lime |
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Answer» Answer: |
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| 46. |
Ripening of fruits is a chemical or physical change? |
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Answer» It's a CHEMICAL PROCESS as it is not REVERSIBLE |
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| 47. |
Calculate the molarity of the 3m aq. solution of NaCl of density 1.25 g ml-1. |
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Answer» Answer: 3.18 M Explanation: by putting the VALUES in the formula we can GET the value of molarity i.e., 3.18 |
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| 48. |
The basic difference approach between mendeleeve and long form of periodic table |
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Answer» Answer: the BASIC classification CHANGES from atomic weight to atomic number is the basic difference in approach between MENDELEEV's periodic table and morden periodic LEAVES PREDICTABLE law is based upon atomic weight of elements where as modern periodic law is based upon atomic number of elements |
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| 49. |
Define chorenchyma? |
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Answer» that is Cholenchyma .. It consist of LIVING cells. Intercellular SPACES are usually absent. Cell WALL is thick as it has pectuj deposition. Cells CONTAIN Cytoplasm. Thet have both vital as well as mechanical functions providing support and elasticity to the plant body. |
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| 50. |
Define latent heat of vaporization. Explainwhy particles in steam have more energythan water at 100°C |
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Answer» ANSWER : latent HEAT of vaporisation: it is the amount of heat energy required to change 1kg of liquid into gas at its atmospheric pressure at its boiling point. explaination: steam causes more BURNS bcoz steam has more heat energy in the FORM of latent heat of vaporisation, then boiling water at the same temperature hope its HELP you thank you ♥️ |
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